Hal, the pinfire in France was more than a decade ahead of England. I think the "cartridge with a nipple" was in answer to the more complicated reloading process of a pinfire in the field.

From AaronN's post.

This advertisement is from the August 15, 1842 issue of the Journal Des Débats. Here Jubé (guy who owned Lefaucheux's company from December 17, 1835 until January 1, 1845 ) advertises an improvement. He mentions to hunters that they no longer need to worry about running out of pinfire cartridges as he will provide a new invention of a reusable cartridge that can be loaded with percussion caps free with every gun purchase.

http://www.bakercollectors.com/